Mercury MerCruiser MCM 454 Mag MPI Service Manual page 753

TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Code 15 (3 of 3): Engine Coolant Temperature (ECT) Sensor Circuit
(Non-Scan) High Temperature Indicated
STEP
3
4
5
ENGINE COOLANT TEMPERATURE SENSOR CHART
Index
Page 5G-8
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ACTION
Locate and repair intermittent faulty connec-
tions. If OK, replace faulty ECT sensor.
Locate and repair short to ground in CKT 410.
If a problem is found, repair as necessary. Was
a problem found?
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
Temperature - to - Resistance Values (Approximate)
F
210
160
100
70
40
20
0
-40
VALUE
ECT Sensor
C
100
70
38
20
4
-7
-18
-40
SERVICE MANUAL NUMBER 23
YES NO
PROCEED TO
– –
Verify
– Step 5
Repair
– –
OHMS
185
450
1,800
3,400
7,500
13,500
25,000
100,700
90-861326--1 MARCH 1999